What is the immediate action to take when someone shows signs of anaphylaxis?

When someone shows signs of anaphylaxis, the immediate action to take is to call for emergency medical assistance, which is represented by contacting 999. Anaphylaxis is a severe and potentially life-threatening allergic reaction that requires prompt medical treatment. By calling for help, you ensure that trained professionals can attend to the person and provide the necessary interventions, such as administering epinephrine or other treatments, as quickly as possible.

In this situation, it is critical to act fast because the symptoms of anaphylaxis can escalate rapidly. The other options, while they may seem helpful in different contexts, are not appropriate responses to anaphylaxis. For example, giving water can lead to choking or may interfere with breathing, applying an ice pack does not address the underlying reaction, and giving aspirin could worsen symptoms due to potential allergic reactions or complications. Thus, the focus should be on ensuring emergency medical care is on the way without delay.